I have had a T637 that I have used for about 4 years and I am thinking
about getting a newer SE phone. I don't need too many features,
although bluetooth is something I like having.
I have a w300i which is a walkman phone but it did not seem to me to
have the same sound quality and I went back to using my T637. I don't
know if the w300i was just a bad phone from the start or if it was a
lower quality phone.
The 637 is a piece of ****. I recently upgraded from a 637 to a 580i and
couldn't be happier. The 580 is superior in every way, reception, voice
quality, features and it has bluetooth.